[mpich-discuss] Re: MPI_Brecv vs multiple MPI_Irecv

[Robert Kubrick]

I just found out that the standard actually doesn't have an MPI_Brecv  
call.
Any reason why the recv can not buffer messages in a user-provided  
memory space, as per MPI_Battach/MPI_Bsend?

On Aug 26, 2008, at 4:17 PM, Robert Kubrick wrote:

> From a performance point of view, which one is better:
>
> MPI_Battach(10*sizeof(MSG))
> MPI_Brecv()
>
> or
>
> MPI_recv_init()
> MPI_recv_init()
> MPI_recv_init()
> ... /* 10 recv handlers */
> MPI_Start(all recv)
> MPI_Waitany()
>
>
> I understand MPI_Brecv will require an extra message copy, from the  
> attached buffer to the MPI_Brecv() buffer. I'd like to know if  
> there other differences between the two methods.
>
> Thanks,
> Rob